Chemistry
Chemistry of Gases and Applications
1,190 Questions
The chemistry of gases covers atmospheric composition, noble gases, and various applications of gas compounds in industrial and biological processes. Understanding the properties of common gases, their reactions, and environmental occurrences is vital for general science sections. Use these questions to practice identifying gases and their specific uses.
Atmospheric gasesNoble gasesGas applicationsChemical compounds
Chemistry of Gases and Applications Questions
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HCl
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Helium gas
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Proteins
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Plastics
B
Correct answer
Explanation
It is a nobel gas. Nobel gases experience london dispersion force. The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.
A
Correct answer
Explanation
The atmosphere consists of 78% nitrogen.
A
Correct answer
Explanation
Freon is a trade name for a group of chlorofluorocarbons (CFCs) and related compounds used primarily as refrigerants. Neon, Boron, and Krypton are chemical elements.
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Water vapours
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O2 gas
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N2
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Inert gases
C
Correct answer
Explanation
The earth's atmosphere near the surface is composed primarily of Nitrogen and Oxygen. Together, the two comprise about 99% of the gas in the atmosphere. Percentage of Nitrogen in the atmosphere is about 78.084% which is the maximum amount.
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Carbon dioxide
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Air
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Lemonade
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Vinegar
A
Correct answer
Explanation
Carbon dioxide is a chemical compound consisting of a single type of molecule (CO2), whereas air, lemonade, and vinegar are mixtures containing multiple types of molecules.
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Oxygen
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Nitrogen
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Carbon dioxide
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Sulphur dioxide
B
Correct answer
Explanation
Earth's atmosphere is composed of approximately 78% nitrogen, making it the most abundant gas in the air.
A
Correct answer
Explanation
Air is a mixture of gases, primarily nitrogen and oxygen, that surrounds the Earth.
C
Correct answer
Explanation
A gel is a colloid where a liquid is dispersed in a solid medium. Examples include jelly or butter.
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they are easily affected by oxidising agents
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they show variable valencies
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their outermost shell is complete
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they are chemically inactive
D
Correct answer
Explanation
Noble gases are also known as inert gases and do not take part in chemical reactions.
B
Correct answer
Explanation
Chlorine gas is yellowish green in colour having melting point -101 ̊ C and boiling point -35 ̊ C.
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Viscosity
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Acidity
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Basicity
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Surface tension
D
Correct answer
Explanation
Water has a very high surface tension compared to most other liquids due to the strong hydrogen bonding between its molecules.
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acidic
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basic
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hydrophilic
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hydrophobic
C
Correct answer
Explanation
Hydrophilic substances are water-loving and dissolve readily in water, whereas hydrophobic substances are water-fearing and do not dissolve well.
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adhesion
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cohesion
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evaporation
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condensation
B
Correct answer
Explanation
Cohesion is the attraction of molecules of the same substance to each other, such as water molecules sticking to other water molecules via hydrogen bonds.
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cold water
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warm water
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soft water
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hard water
D
Correct answer
Explanation
Hard water contains dissolved calcium and magnesium ions that react with soap to form an insoluble precipitate known as scum. This prevents the soap from forming a lather, thereby reducing its cleaning effectiveness.
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Water shows capillary action.
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Ice is denser than water.
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Water is not a very strong solvent.
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The intermolecular bonding in case of water is hydrogen bonding.